Preparation method of layered nickel cobalt lithium manganate cathode material

A technology of nickel-cobalt lithium manganese oxide and positive electrode materials, which is applied in the direction of positive electrodes, battery electrodes, active material electrodes, etc., can solve the problems of poor repeatability and complicated operation, and achieve the effect of excellent electrochemical performance

Inactive Publication Date: 2016-07-20
LIUZHOU KAITONG NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the preparation methods of nickel-cobalt-manganese-lithium cathode materials include high-temperature solid-phase method, coprecipitation method, sol-gel method, spray pyrolysis method, hydrothermal synthesis method and combustion method, etc., but coprecipitation method is still used more. This method is complicated to operate, has poor repeatability and requires strict control of experimental conditions, which limits the industrial production and practical application of nickel-cobalt-manganese-lithium cathode materials to a certain extent.

Method used

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Examples

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preparation example Construction

[0019] The preparation method of layered nickel cobalt lithium manganese oxide positive electrode material, it comprises the following steps:

[0020] (1) According to the stoichiometric ratio, the solid Mn(NO 3 ) 2 、CoCO 3 , Ni(NO 3 ) 2 ·6H 2 O and Li 2 CO 3 The mixture is put into the inner cavity of the rotating drum, specifically, the mixture is put into the inner cavity of the vertical drum rotating at high speed from top to bottom, and the vertical drum is used to facilitate the feeding and discharging; the rotating drum transfers the mixture under the action of centrifugal force. Throwing out from the inner cavity, during the implementation process, the lower side wall of the drum is provided with several through holes along the circumference, so that the high-speed rotating drum can throw the mixture in the inner cavity out of the through holes in the lower side wall under the action of centrifugal force The mixture thrown out is dropped into the inner cavity of...

Embodiment 1

[0026] Solid Mn(NO 3 ) 2 、CoCO 3 , Ni(NO 3 ) 2 ·6H 2 O and Li 2 CO 3 The mixture is poured into the inner chamber of the high-speed rotating vertical drum from top to bottom, and the high-speed rotating drum throws the mixture in the inner chamber from the through hole of the lower side wall under the centrifugal force; After blowing up to the cylinder cover on the upper side of the drum, the mixture hits the cylinder cover and then puts it into the inner cavity of the drum again, and circulates like this; after about 10 minutes, put the mixture in a ball mill and add an appropriate amount of absolute ethanol, and then use 350 / min The speed of ball milling was 60min, and then the slurry after ball milling was dried in a drying oven at 60°C to obtain a precursor; the precursor was pre-fired in a resistance furnace under a compressed air atmosphere, and the pre-fire temperature was 450°C, and the time 5h; after pre-calcination, grind, and then place the ground material in...

Embodiment 2

[0028] Solid Mn(NO 3 ) 2 、CoCO 3 , Ni(NO 3 ) 2 ·6H 2 O and Li 2 CO 3 The mixture is poured into the inner chamber of the high-speed rotating vertical drum from top to bottom, and the high-speed rotating drum throws the mixture in the inner chamber from the through hole of the lower side wall under the centrifugal force; After blowing up to the cylinder cover on the upper side of the drum, the mixture hits the cylinder cover and then puts it into the inner cavity of the drum again, and circulates like this; after about 15 minutes, put the mixture in a ball mill and add an appropriate amount of absolute ethanol, and then use 380 / min The speed of ball milling was 50min, and then the slurry after ball milling was dried in a drying oven at 70°C to obtain a precursor; the precursor was placed in a resistance furnace and pre-fired in a compressed air atmosphere at a temperature of 500°C. 4.5h; after pre-calcination, grind, and then put the ground material in a rotary roaster a...

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Abstract

The invention relates to a nickel cobalt lithium manganate cathode material, in particular to a preparation method of a layered nickel cobalt lithium manganate cathode material. The preparation method comprises the following steps: feeding a mixture of solid-state Mn(NO3)2, CoCO3, Ni(NO3)2.6H2O and Li2CO3 into an inner cavity of a rotating drum according to a stoichiometric ratio; throwing out the mixture from the inner cavity by using the rotating drum under the action of centrifugal force, and feeding the mixture into the inner cavity of the drum again to obtain a uniform mixture; adding a dispersant to the uniform mixture for ball milling; placing ball-milled slurry in a drying oven for drying to obtain a precursor; presintering the precursor in a resistance furnace; grinding the presintered precursor, and placing the ground materials in a rotary roaster for roasting. According to the preparation method of the invention, the centrifugal force and a fan are used to enable the mixed materials to achieve irregular circulating motion, so as to achieve the purpose of mixing the materials uniformly without dead corner; the nickel cobalt lithium manganate cathode material with excellent electrochemical properties is obtained through presintering and roasting.

Description

technical field [0001] The invention relates to a positive electrode material of a nickel-cobalt-manganese lithium battery, in particular to a preparation method of a layered nickel-cobalt-manganese lithium manganese oxide positive electrode material. Background technique [0002] In recent years, new lithium-ion composite cathode materials have developed rapidly, especially nickel-cobalt-manganese-lithium cathode materials, which have become a hot research topic for experts and scholars at home and abroad. with commercial LiCoO 2 Compared with the nickel-cobalt-manganese-lithium cathode material, it has the advantage of low cost; compared with LiNiO 2 Compared with nickel-cobalt-manganese-lithium cathode materials, it is easier to synthesize, and the cycle performance and thermal stability are relatively good; compared with spinel LiMn 2 o 4 Generally speaking, the nickel-cobalt-manganese-lithium cathode material has a more stable structure during charge and discharge, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/131H01M4/1391H01M10/0525
CPCH01M4/131H01M4/1391H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 黎超英吴沛荣
Owner LIUZHOU KAITONG NEW MATERIAL TECH CO LTD
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